Victor posted the announcement as a Google docs link in the app’s discord this morning.
Basically they said that developing two apps was slowing down development.
Specifically on Linux support they said this:
We’re also exploring what Linux support might look like for Vortex in the future. While getting every game and mod working on Linux might not be possible, it’s an area we want to keep evaluating where it makes sense.
A bit of both? You can run into cryptic errors and weird issues even modding Bethesda games with Vortex, but there’s definitely games that are dramatically more complicated and finicky to mod whether you’re using Vortex or just doing it manually.